I just found a great web page – http://www.onebag.com/bags.html
Doug talks about 3 main things a one-bag traveller needs to know (in order of importance):
1. What to pack, avoiding the temptation of lugging around too much stuff, plus how (and why) to use a packing list
2. What to pack it in, understanding what to look for in efficient and effective luggage
3. How to pack it, particularly the management of clothing so that it doesn’t get wrinkled
Great!